+accidentalStyle =
+#(define-music-function
+ (parser location context style) ((symbol?) string?)
+ (_i "Set accidental style to @var{style}, a string. If an optional
+@var{context} symbol is given, e.g. @code{#'Staff} or @code{#'Voice},
+the settings are applied to that context. Otherwise, the context
+defaults to @samp{Staff}, except for piano styles, which use
+@samp{GrandStaff} as a context." )
+ (if context
+ (set-accidental-style (string->symbol style) context)
+ (set-accidental-style (string->symbol style))))